Hammock stand



FIG. 1 is a front perspective view illustrating my design for a hammock stand;

FIG. 2 is a front perspective view; the rear view being a mirror image thereof;

FIG. 3 is a right end view of the hammock stand shown in FIG. 2, with the left end view being a mirror image thereof;

FIG. 4 is a top view of my design for a hammock stand; and,

FIG. 5 is a bottom view of my design for a hammock stand.

The broken line showing of a hammock is included for the purpose of illustration and forms no part of the claimed design. 

The ornamental design for a hammock stand, as shown and described. 